Founded in 1873, Stanley County is one of 66 counties in the state of South Dakota. Historically, Stanley County was formed from unorganized territory. The city of Fort Pierre is the county seat. With FIPS code of 117, Stanley County has a population of 3,032 and area of 1,443 square miles (3,737 km2).
List of all cities in Stanley County, SD alphabetically
| City/Town | Postal Code | Area Code |
| Fort Pierre, SD | 57532 | 605 |
| Hayes, SD | 57537 | 605 |
| Lacy, SD | 57532 | 605 |
| Laroche, SD | 57532 | 605 |
| Lindsey, SD | 57532 | 605 |
| Mission Ridge, SD | 57532 | 605 |
| Norman Ranch, SD | 57532 | 605 |
| Orton, SD | 57532 | 605 |
| Sansarc, SD | 57537 | 605 |